Plymor Flat Open Clear Plastic Poly Bags, 18" x 30" What size bag to order? Measure your item by its width, height, and depth because the plastic bag needs to fit all the way around it. Item width + item depth = bag width. Item height + item depth = bag height. What is a Mil? "Mil" is the plastic thickness. 2 Mil = .002", standard sandwich bag thickness. 4 Mil = .004", thicker than a standard freezer bag and excellent for heavy duty applications. Are the bags food safe? Yes! Because our flat bags are made from virgin LDPE (low density polyethylene), they meet FDA requirements for food contact and storage, and are BPA-Free. How to use the bags? Our various sizes of flat bags are extremely versatile and great for packaging, shipping, or storage. Excellent for organizing and separating samples, food, candy, jewelry, cards, craft supplies, paper, office supplies, school supplies, hardware, collectibles, yarn, sewing kits, quilting supplies, toys, clothing, merchandise for resale, or makeup with protection from moisture and dust. 2 Mil Clear, 18x30 4 Mil Clear, 18x30 Add to Cart Add to Cart Price $216.16$216.16 $259.41$259.41 2 Mil ✓ no data 4 Mil no data ✓